DNS problems affecting e-mail delivery: PTR records

Having outgoing e-mail rejected due to domain name system configuration issues is a common problem that Internet e-mail server administrators face. There are eight things you can check to make sure that your DNS is configured for optimum delivery. I will be covering a different item in each day of this series.

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SMTP pipelining

Command pipelining is an extension to SMTP, the simple mail transport protocol, which speeds up the normal back and forth communication by sending multiple commands in a batch without waiting for a response to each one.

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